GUANGZHOU, CHINA - JULY 14: A woman looks at her smartphone while walking past a SHEIN sign outside the company's office on July 14, 2026, in Guangzhou, Guangdong Province, China. Cheng Xin | Getty Images News | Getty ImagesShein's U.S. business is under investigation by the Federal Trade Commission, the fast fashion giant revealed in documents connected to its upcoming Hong Kong IPO. In the filing, the Chinese-founded company didn't say what the FTC is investigating, but the disclosure appears...